The Power of Movement in Plants eBook

Francis Darwin
This eBook from the Gutenberg Project consists of approximately 654 pages of information about The Power of Movement in Plants.


Modified circumnutationNyctitropic or sleep movements of leaves.

Conditions necessary for these movements—­List of Genera and Families, which include sleeping plants—­Description of the movements in the several Genera—­Oxalis:  leaflets folded at [page viii.] night—­Averrhoa:  rapid movements of the leaflets—­Porlieria:  leaflets close when plant kept very dry—­Tropaeolum:  leaves do not sleep unless well illuminated during day—­Lupinus:  various modes of sleeping—­Melilotus:  singular movements of terminal leaflet—­Trifolium—­Desmodium:  rudimentary lateral leaflets, movements of, not developed on young plants, state of their pulvini—­Cassia:  complex movements of the leaflets—­Bauhinia:  leaves folded at night—­Mimosa pudica:  compounded movements of leaves, effect of darkness—­Mimosa albida, reduced leaflets of—­Schrankia:  downward movement of the pinnae—­Marsilea:  the only cryptogam known to sleep—­Concluding remarks and summary—­Nyctitropism consists of modified circumnutation, regulated by the alternations of light and darkness—­Shape of first true leaves...Page 317-417


Modified circumnutationMovements excited by light.

Distinction between heliotropism and the effects of light on the periodicity of the movements of leaves—­Heliotropic movements of Beta, Solanum, Zea, and Avena—­Heliotropic movements towards an obscure light in Apios, Brassica, Phalaris, Tropaeolum, and Cassia—­Apheliotropic movements of tendrils of Bignonia—­Of flower-peduncles of Cyclamen—­Burying of the pods—­Heliotropism and apheliotropism modified forms of circumnutation—­ Steps by which one movement is converted into the other—­ Transversal-heliotropismus or diaheliotropism influenced by epinasty, the weight of the part and apogeotropism—­Apogeotropism overcome during the middle of the day by diaheliotropism—­Effects of the weight of the blades of cotyledons—­So called diurnal sleep—­Chlorophyll injured by intense light—­Movements to avoid intense light...418-448


Sensitiveness of plants to lightIts transmitted effects.

Uses of heliotropism—­Insectivorous and climbing plants not heliotropic—­ Same organ heliotropic at one age and not at another—­Extraordinary sensitiveness of some plants to light—­The effects [page ix.] of light do not correspond with its intensity—­Effects of previous illumination—­Time required for the action of light—­After-effects of light—­Apogeotropism acts as soon as light fails—­Accuracy with which plants bend to the light—­This dependent on the illumination of one whole side of the part—­Localised sensitiveness to light and its transmitted effects—­Cotyledons

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The Power of Movement in Plants from Project Gutenberg. Public domain.
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